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<p class='vspace'></p><h2>Keywords</h2>
<p>Keywords are constants, variables and function names that are defined as part of the Arduino language. Avoid using keywords for variable names.
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<table  width='90%' border='0' cellpadding='5' cellspacing='0'><tr><td  width='33%' valign='top'>
<pre>
# Constants

HIGH	
LOW	
INPUT	
OUTPUT	
SERIAL	
DISPLAY	
PI	
HALF_PI	
TWO_PI	
LSBFIRST	
MSBFIRST	
CHANGE	
FALLING	
RISING	
false		
true		
null	

# Port Variables &amp; Constants

DDRB
PINB
PORTB
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7

DDRC
PINC
PORTC
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7

DDRD
PIND
PORTD
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7

# Datatypes

boolean	
byte	
char	
class		
default		
do		
double		
int	
long	

</pre></td><td  width='33%' valign='top'> 
<pre>
private		
protected		
public		
return		
short		
signed	
static		
switch		
throw		
try		
unsigned	
void		

# Other

abs
acos
+=
+
[]
asin
=
atan
atan2
&amp;
|
boolean
byte
case
ceil
char
char
class
,
//
?:
constrain
cos
{}
--
default
delay
delayMicroseconds
/
/**
. 
else
==
exp
false
float
float
floor
for
&lt;
&lt;=
HALF_PI
if
++
!=
int
&lt;&lt;
&lt;
&lt;=
log
&amp;&amp;
!
||


</pre>
<p class='vspace'></p></td><td  width='33%' valign='top'> 
<p class='vspace'></p><pre>

loop
max
millis
min
-
%
/*
*
new
null
()
PI
return
&gt;&gt;
;
Serial	
Setup
sin
sq
sqrt
-=
switch
tan
this
true
TWO_PI
void
while
Serial	
begin	
read
print
write
println
available
digitalWrite	
digitalRead
pinMode
analogRead
analogWrite
attachInterrupts
detachInterrupts
beginSerial
serialWrite
serialRead
serialAvailable
printString
printInteger
printByte
printHex
printOctal
printBinary
printNewline
pulseIn
shiftOut

</pre></td></tr></table>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?board=swbugs' rel='nofollow'>Forum</a>.</em>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>.  Code samples in the reference are released into the public domain.
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